Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9658f9d7654a6f7…

MALICIOUS

PDF

71.6 KB Created: 2021-09-25 09:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab0e44fb291735ff9626b12bb8e5f9ab SHA-1: 9d2b84967b920793af16c906f27a941f8ed88866 SHA-256: e9658f9d7654a6f718f14cdb2dcde59bee36261d4617609935527cd4153ff4cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of link farms hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is structured to redirect users to malicious content. No scripts were extracted, but the overall structure and URL patterns are strongly indicative of a phishing or downloader attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://allytemp.ru/uplcv?utm_term=download+god+hand+psp+iso PDF link annotation
    • http://stroykap.com/application/views/stroykap/userfiles/file/lozulimomenukejezulowujow.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/1232016388.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/64237676195.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/67867243592.pdfIn PDF document text
    • https://pianotuningdarwin.com/userfiles/files/36549260288.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/govelikuvid.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/nepelun.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/d574c3b4a75e162e175f345266a89a22/widabipidowijilogatovuf.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/popotud.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/tek4ftahlklo40fgal18r517ua/8925810710.pdfIn PDF document text
    • http://favourtec.com/attachment/file/80295135540.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/67127040898.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/32164345756.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/60115476249.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/51433633566.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/161372b85a34fa---30874313346.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/46626542381.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pelilojomozovizawofibijaw.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/90849286502.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/4e321ad79d868d09e494ab820c8223c0/69037639814.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/tijanemonowolomitosi.pdfIn PDF document text
    • http://abnicum.com/files/file/54715484578.pdfIn PDF document text
    • http://webs123.com/userfiles/file/40922713490.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/rajamuwajafetowirowina.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/mevofurujogozufigaxov.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/71541319631.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB675 16568 bytes
SHA-256: 6c865f17095e8e7957351b8bd319d7be1cc36423b24e13a5d8706917e7935e85
font_01_sfnt_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91E 10428 bytes
SHA-256: 64df7cdc4272ce57949624c869c16dc17c9e78f3e12bf4b30327beaedf48c21b

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